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From: Laxman Dewangan <ldewangan@nvidia.com>
To: <cw00.choi@samsung.com>, <myungjoo.ham@samsung.com>
Cc: <devicetree-discuss@lists.ozlabs.org>, <rob@landley.net>,
	<linux-doc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<kishon@ti.com>, <gg@slimlogic.co.uk>,
	Laxman Dewangan <ldewangan@nvidia.com>
Subject: [PATCH V2 2/4] extcon: palmas: enable ID_GND and ID_FLOAT detection always
Date: Wed, 10 Jul 2013 11:45:57 +0530	[thread overview]
Message-ID: <1373436959-32444-3-git-send-email-ldewangan@nvidia.com> (raw)
In-Reply-To: <1373436959-32444-1-git-send-email-ldewangan@nvidia.com>

When integrating driver with Tegra platform, it is found that
the ID pins get detected only once after booting system and
further removal and re-insert does not detect the ID pin.

Fixing this issue with enabling interrupt on ID_GND and ID_FLOAT
always  and clearing the status on LATCH register which actually
occurred.

Also if interrupt occurs with line status as zero then based on
previous status, set the cable state.

Add debug prints to display the cable state when any cable
insertion/removal happen.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Acked-by: Graeme Gregory <gg@slimlogic.co.uk>
---
Changes from V1:
- Corrected the print message to have more meaningful.

 drivers/extcon/extcon-palmas.c |   24 +++++++++++-------------
 1 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
index b752a0a..33254d9 100644
--- a/drivers/extcon/extcon-palmas.c
+++ b/drivers/extcon/extcon-palmas.c
@@ -57,6 +57,7 @@ static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
 		if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
 			palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
 			extcon_set_cable_state(&palmas_usb->edev, "USB", true);
+			dev_info(palmas_usb->dev, "USB cable is attached\n");
 		} else {
 			dev_dbg(palmas_usb->dev,
 				"Spurious connect event detected\n");
@@ -65,6 +66,7 @@ static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
 		if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
 			palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 			extcon_set_cable_state(&palmas_usb->edev, "USB", false);
+			dev_info(palmas_usb->dev, "USB cable is detached\n");
 		} else {
 			dev_dbg(palmas_usb->dev,
 				"Spurious disconnect event detected\n");
@@ -84,28 +86,23 @@ static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
 
 	if (set & PALMAS_USB_ID_INT_SRC_ID_GND) {
 		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
-			PALMAS_USB_ID_INT_EN_HI_SET,
-			PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
-		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
-			PALMAS_USB_ID_INT_EN_HI_CLR,
-			PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
-		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 			PALMAS_USB_ID_INT_LATCH_CLR,
 			PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
 		palmas_usb->linkstat = PALMAS_USB_STATE_ID;
 		extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
+		dev_info(palmas_usb->dev, "HOST cable is attached\n");
 	} else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) {
 		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
-			PALMAS_USB_ID_INT_EN_HI_SET,
-			PALMAS_USB_ID_INT_EN_HI_SET_ID_GND);
-		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
-			PALMAS_USB_ID_INT_EN_HI_CLR,
-			PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
-		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 			PALMAS_USB_ID_INT_LATCH_CLR,
 			PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
 		palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 		extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
+		dev_info(palmas_usb->dev, "HOST cable is detached\n");
+	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
+				(!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
+		palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
+		extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
+		dev_info(palmas_usb->dev, "HOST cable is detached\n");
 	}
 
 	return IRQ_HANDLED;
@@ -122,7 +119,8 @@ static void palmas_enable_irq(struct palmas_usb *palmas_usb)
 
 	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 		PALMAS_USB_ID_INT_EN_HI_SET,
-		PALMAS_USB_ID_INT_EN_HI_SET_ID_GND);
+		PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
+		PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
 
 	palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
 
-- 
1.7.1.1


WARNING: multiple messages have this Message-ID (diff)
From: Laxman Dewangan <ldewangan@nvidia.com>
To: cw00.choi@samsung.com, myungjoo.ham@samsung.com
Cc: devicetree-discuss@lists.ozlabs.org, rob@landley.net,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	kishon@ti.com, gg@slimlogic.co.uk,
	Laxman Dewangan <ldewangan@nvidia.com>
Subject: [PATCH V2 2/4] extcon: palmas: enable ID_GND and ID_FLOAT detection always
Date: Wed, 10 Jul 2013 11:45:57 +0530	[thread overview]
Message-ID: <1373436959-32444-3-git-send-email-ldewangan@nvidia.com> (raw)
In-Reply-To: <1373436959-32444-1-git-send-email-ldewangan@nvidia.com>

When integrating driver with Tegra platform, it is found that
the ID pins get detected only once after booting system and
further removal and re-insert does not detect the ID pin.

Fixing this issue with enabling interrupt on ID_GND and ID_FLOAT
always  and clearing the status on LATCH register which actually
occurred.

Also if interrupt occurs with line status as zero then based on
previous status, set the cable state.

Add debug prints to display the cable state when any cable
insertion/removal happen.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Acked-by: Graeme Gregory <gg@slimlogic.co.uk>
---
Changes from V1:
- Corrected the print message to have more meaningful.

 drivers/extcon/extcon-palmas.c |   24 +++++++++++-------------
 1 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
index b752a0a..33254d9 100644
--- a/drivers/extcon/extcon-palmas.c
+++ b/drivers/extcon/extcon-palmas.c
@@ -57,6 +57,7 @@ static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
 		if (palmas_usb->linkstat != PALMAS_USB_STATE_VBUS) {
 			palmas_usb->linkstat = PALMAS_USB_STATE_VBUS;
 			extcon_set_cable_state(&palmas_usb->edev, "USB", true);
+			dev_info(palmas_usb->dev, "USB cable is attached\n");
 		} else {
 			dev_dbg(palmas_usb->dev,
 				"Spurious connect event detected\n");
@@ -65,6 +66,7 @@ static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
 		if (palmas_usb->linkstat == PALMAS_USB_STATE_VBUS) {
 			palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 			extcon_set_cable_state(&palmas_usb->edev, "USB", false);
+			dev_info(palmas_usb->dev, "USB cable is detached\n");
 		} else {
 			dev_dbg(palmas_usb->dev,
 				"Spurious disconnect event detected\n");
@@ -84,28 +86,23 @@ static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
 
 	if (set & PALMAS_USB_ID_INT_SRC_ID_GND) {
 		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
-			PALMAS_USB_ID_INT_EN_HI_SET,
-			PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
-		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
-			PALMAS_USB_ID_INT_EN_HI_CLR,
-			PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
-		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 			PALMAS_USB_ID_INT_LATCH_CLR,
 			PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
 		palmas_usb->linkstat = PALMAS_USB_STATE_ID;
 		extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
+		dev_info(palmas_usb->dev, "HOST cable is attached\n");
 	} else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) {
 		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
-			PALMAS_USB_ID_INT_EN_HI_SET,
-			PALMAS_USB_ID_INT_EN_HI_SET_ID_GND);
-		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
-			PALMAS_USB_ID_INT_EN_HI_CLR,
-			PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
-		palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 			PALMAS_USB_ID_INT_LATCH_CLR,
 			PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
 		palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
 		extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
+		dev_info(palmas_usb->dev, "HOST cable is detached\n");
+	} else if ((palmas_usb->linkstat == PALMAS_USB_STATE_ID) &&
+				(!(set & PALMAS_USB_ID_INT_SRC_ID_GND))) {
+		palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
+		extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
+		dev_info(palmas_usb->dev, "HOST cable is detached\n");
 	}
 
 	return IRQ_HANDLED;
@@ -122,7 +119,8 @@ static void palmas_enable_irq(struct palmas_usb *palmas_usb)
 
 	palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
 		PALMAS_USB_ID_INT_EN_HI_SET,
-		PALMAS_USB_ID_INT_EN_HI_SET_ID_GND);
+		PALMAS_USB_ID_INT_EN_HI_SET_ID_GND |
+		PALMAS_USB_ID_INT_EN_HI_SET_ID_FLOAT);
 
 	palmas_vbus_irq_handler(palmas_usb->vbus_irq, palmas_usb);
 
-- 
1.7.1.1

  parent reply	other threads:[~2013-07-10  6:08 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-10  6:15 [PATCH V2 0/4] extcon: palmas: clean-up/fixes and suspend/resume susupport Laxman Dewangan
2013-07-10  6:15 ` Laxman Dewangan
2013-07-10  6:15 ` [PATCH V2 1/4] extcon: palmas: remove unused member from palams_usb structure Laxman Dewangan
2013-07-10  6:15   ` Laxman Dewangan
2013-07-10  6:15 ` Laxman Dewangan [this message]
2013-07-10  6:15   ` [PATCH V2 2/4] extcon: palmas: enable ID_GND and ID_FLOAT detection always Laxman Dewangan
2013-07-10  7:02   ` Chanwoo Choi
2013-07-10  7:16     ` Laxman Dewangan
2013-07-10  7:16       ` Laxman Dewangan
2013-07-10  6:15 ` [PATCH V2 3/4] extcon: palams: add support for suspend/resume Laxman Dewangan
2013-07-10  6:15   ` Laxman Dewangan
2013-07-10  6:15 ` [PATCH V2 4/4] extcon: palmas: Option to disable ID/VBUS detection based on platform Laxman Dewangan
2013-07-10  6:15   ` Laxman Dewangan
2013-07-10  6:55   ` Chanwoo Choi
2013-07-10  7:13     ` Laxman Dewangan
2013-07-10  7:13       ` Laxman Dewangan
2013-07-10  7:34       ` Chanwoo Choi
2013-07-10  7:34         ` Chanwoo Choi
2013-07-10  8:42         ` Laxman Dewangan
2013-07-10  8:42           ` Laxman Dewangan
2013-07-10  6:57 ` [PATCH V2 0/4] extcon: palmas: clean-up/fixes and suspend/resume susupport Chanwoo Choi
2013-07-10  7:14   ` Laxman Dewangan
2013-07-10  7:14     ` Laxman Dewangan

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